package com.hutao.medical.common.util;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;

public class ImageRotateUtil {

	 public static BufferedImage Rotate(Image src, int angel) {
		 	//获取图片宽度
	        int src_width = src.getWidth(null);  
	       //获取图片高度
	        int src_height = src.getHeight(null);  
	        // calculate the new image size  
	        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(  
	                src_width, src_height)), angel);  
	  
	        BufferedImage res = null;  
	        res = new BufferedImage(rect_des.width, rect_des.height,  
	                BufferedImage.TYPE_INT_RGB);  
	        Graphics2D g2 = res.createGraphics();  
	        // transform  
	        g2.translate((rect_des.width - src_width) / 2,  
	                (rect_des.height - src_height) / 2);  
	        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);  
	  
	        g2.drawImage(src, null, null);  
	        return res;  
	    }  
	  
	    public static Rectangle CalcRotatedSize(Rectangle src, int angel) {  
	        // if angel is greater than 90 degree, we need to do some conversion  
	        if (angel >= 90) {  
	            if(angel / 90 % 2 == 1){  
	                int temp = src.height;  
	                src.height = src.width;  
	                src.width = temp;  
	            }  
	            angel = angel % 90;  
	        }  
	  
	        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;  
	        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;  
	        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;  
	        double angel_dalta_width = Math.atan((double) src.height / src.width);  
	        double angel_dalta_height = Math.atan((double) src.width / src.height);  
	  
	        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha  
	                - angel_dalta_width));  
	        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha  
	                - angel_dalta_height));  
	        int des_width = src.width + len_dalta_width * 2;  
	        int des_height = src.height + len_dalta_height * 2;  
	        return new java.awt.Rectangle(new Dimension(des_width, des_height));  
	    }  
}
